Can I take a booking for a large group, like a big family or a company trip, on my white label travel portal?

Yes, but only up to the passenger limit the supplier allows on a single booking. Your portal handles a family or a small company trip in the normal way, and for most enquiries that is all you need. Once the party gets larger than the limit the airline or the hotel sets for one booking, the search will either stop returning results or come back empty, because at that size the supplier treats the trip as a group and wants to quote it by hand.

When that happens you have two sensible options. You can split the party across more than one booking, which usually works, although you should warn your customer that the price can move between bookings and that seats or rooms may not end up together. Or you can approach the airline or the hotel directly, ask for a group quote, and handle the names and the payment yourself, the way agents did before portals existed.

A booking you arrange that way still belongs in your system. You can enter it as a manual booking so the customer, the payment and the travel documents sit alongside everything else, and your reports stay complete at the end of the month. Whether your site also carries a group enquiry form, so that large parties reach you instead of hitting a dead end in search, depends on the plan and the setup you have chosen.

The useful next step is to check the passenger limit on each supplier you are connected to, since it is not the same everywhere, and then decide how you want large enquiries to come through to you.